The Seiko Turtle is a Prospex diver known for its rounded, cushion-shaped case and the crown tucked at 4 o’clock. The current SRPE93 carries that design lineage, but it is not simply the original 1970 watch unchanged: Seiko lists it with a modern 4R36 automatic movement, Hardlex crystal and a silicone strap.
Why is it called the Seiko Turtle?
“Turtle” is a fan nickname for the watch’s broad, rounded case, whose cushion-like outline suggests a shell. Seiko’s UK boutique uses the silhouette to explain the name. The defining shape is not just decoration: the case flows around a crown positioned at 4 o’clock, helping protect it from knocks.
The nickname belongs to a design lineage rather than a claim that every Turtle is mechanically identical. Seiko identifies its 1970 diver as the father of the Turtle, and says a subsequent version sharing the protected 4 o’clock crown and flowing case became known by the nickname. Seiko UK’s SRPE93K1 listing and Seiko’s 2019 account of the 1970 diver describe that connection.
How did the Turtle design develop?
Seiko’s official diver-watch timeline begins in 1965 with Japan’s first diver’s watch, rated to 150 m. It records a 300 m model in 1968, followed in 1970 by a 150 m diver with a protected crown at 4 o’clock. Seiko describes the broad, flowing case as functional crown protection and identifies that 1970 design as the ancestor of the Turtle. Seiko’s diver-watch history provides the timeline.
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- WATER-RESISTANT: these water-resistant men's dive watches are ISO scuba-approved to depths of 200 meters
- AUTOMATIC: these self-winding, automatic men's watches are powered by your movement, with a power reserve of 41 hours
- STAINLESS STEEL: features a durable stainless steel watch case and coordinating silicone watch band
- LUMIBRITE DISPLAY: this men's automatic watch features a highly-legible display with LumiBrite hands and markers
- 4R36 CALIBER: equipped with the reliable caliber 4R36 automatic movement, this accurate men's watch keeps precise time
That history explains the modern watch’s recognizable outline; it does not establish that the SRPE93 shares every specification, component or construction detail with a vintage reference. For a vintage-versus-current comparison, use the old watch’s exact reference and condition rather than assuming all models called Turtles are interchangeable.
What does the current Seiko Turtle SRPE93 offer?
Seiko’s US listing identifies the SRPE93 as a Prospex Sea model. Its specifications are:
Rank #2
- Seiko Model Prospex SRPE93K1 Diver's Automatic Turtle Watch
- Analogue for men
- 13 mm calendar day and date buckle
| Feature | Seiko SRPE93 specification |
|---|---|
| Movement | Caliber 4R36 automatic, with manual winding and stop-seconds function |
| Power reserve | Approximately 41 hours |
| Display | Day and date |
| Case | Stainless steel; 45.0 mm diameter and 13.4 mm thickness |
| Crystal | Hardlex |
| Dial illumination | LumiBrite on hands and indices |
| Water resistance | 200 m / 660 ft diver’s water resistance |
| Bezel and case features | Unidirectional rotating bezel, screw-down crown and screw case back |
| Supplied strap | Silicone |
| Lug distance | 22 mm |
| Weight | 124.0 g |
These are manufacturer-listed specifications, not independent test results. Seiko says the model follows ISO standards for scuba diving up to 200 m; its product specification block gives the rating as 200 m / 660 ft. The cited listing does not name an ISO edition or provide an independent certificate. See the official SRPE93 product page for Seiko’s specifications.
Is the SRPE93 the same watch as the vintage Turtle?
No—not in the sense of being the original 1970 watch carried forward without change. It is a current Prospex model that recalls the earlier design. Seiko’s 2019 description calls the 1970 diver the Turtle’s “father” and says the modern Prospex recreation pays tribute to the original team; that is a statement of lineage and homage, not a claim of mechanical identity.
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Rank #3
- STUNNING BLUE DIAL: this rugged sports watch features a beautiful Manta Ray-patterned blue dial, with Lumibrite dial indicator hands and markers for low light and a magnified day/date calendar
- BLACK BEZEL: this versatile men’s watch features a black ceramic unidirectional bezel with distinctive scalloped edging, for elapsed timing
- AUTOMATIC & MANUAL: SRPF77 automatic watches for men power up with your natural movements, and feature the ability to wind manually, with 41 hours of reserve power
- WATER-RESISTANT: these rugged stainless steel dive watches for men feature a deep blue silicone strap and are both stylish and robust, following ISO standards for scuba, and are water-resistant to 200 meters
- 4R36 CALIBER: equipped with the reliable 4R36 caliber, these precise men’s wrist watches ensure the most accurate timekeeping
For practical comparison, separate the shared design idea from reference-specific facts. The lineage concerns the flowing case and protected 4 o’clock crown. The SRPE93’s published details—such as its 4R36 movement, dimensions, Hardlex crystal, water-resistance rating and supplied silicone strap—describe this current model and should not be projected onto a vintage example.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should you consider before choosing one?
Case size
The listed diameter is 45.0 mm, a concrete sizing consideration for anyone comparing it with a smaller watch. Diameter alone does not establish how it will feel on a particular wrist, and the available specifications do not support a subjective fit verdict.
Rank #4
- PADI SPECIAL EDITION: Men's Prospex Sea diver featuring a PADI Special Edition design with a stainless-steel case and ceramic bezel display.
- AUTOMATIC MOVEMENT: Seiko 4R36 automatic movement offers manual winding, 24 jewels, day/date display, stop-second function, and approximately 41 hours of power reserve.
- 200M DIVER'S WATER RESISTANCE: Rated to 200 meters / 660 feet for diving, with a screw-down crown and screw case back.
- SAPPHIRE CRYSTAL: Sapphire crystal with magnifier and inner anti-reflective coating provides durable dial protection and improved readability.
- DIVER-READY FEATURES: 45mm stainless-steel case, unidirectional rotating bezel, LumiBrite hands, indexes and bezel, plus a secure three-fold clasp with extender.
Strap options
The SRPE93 comes with a silicone strap and has a stated 22 mm distance between the lugs, which is the first measurement to check when considering another strap. Width alone does not guarantee fit: confirm that the specific strap’s shape and end design work with the SRPE93 case. The published specification does not establish universal compatibility for aftermarket straps, bracelets or end links.
Regional listing details and price
Seiko’s UK boutique lists the SRPE93K1 under the Prospex “Turtle” name, with a 4R36 movement, 41-hour reserve, 45 mm diameter, 13.42 mm thickness, 22 mm lug width, 20 bar water resistance and Hardlex. The slight thickness and wording differences from the US listing reflect how regional pages present specifications; they are not, by themselves, evidence of a materially different watch.
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Best Value
- WATER-RESISTANT: these water-resistant men's dive watches are ISO scuba-approved to depths of 200 meters
- AUTOMATIC: these self-winding, automatic men's watches are powered by your movement, with a power reserve of 41 hours
- LUMIBRITE DISPLAY: this men's dive watch features a highly-legible display with LumiBrite hands and markers
- STAINLESS STEEL: this diving watch for men features a stainless steel watch case and bracelet, a uni-directional rotating elapsed timing bezel, and a bold blue dial evoking signature PADI colors
- 4R36 CALIBER: equipped with the reliable caliber 4R36 automatic movement, this accurate men's watch keeps precise time
When checked on 8 October 2026, Seiko’s US SRPE93 listing displayed USD 525. That is a dated US listing price, not a guaranteed transaction price or a price for every region. Check the local Seiko listing for current availability and pricing.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
